What! ? Seriously? My senior's slutty sex friend was my older sister! My older sister showed me a photo of my recently created sex friend! ? My sister, who grew up in a school with strict rules for elementary, junior high and high school, is extremely strict and shitty. To be honest, he's an annoying person who always keeps silly preaching to me. However, only after entering university was happy to be cheered on by the opposite sex, and before I knew it, I had become a slut. I'm shocked to learn about my sister's true nature. What's more, will the senior be having a threesome next time? He invited me to do that! Inside I want to make my reliable sister a mess one day...

My older sister was in the photo of my sex friend that my senior at my part-time job showed me! My sloppy, super-serious, annoying sister who is always loud and talks about me, is the first time I entered university that she was happy to be cheered on by the opposite sex, and she quickly became a slut who can do it! My senior invited me to have a threesome next time, shocked me! I wanted to make my sister crazy so I decided to join. On the day, my sister was surprised and tried to run away, but she caught her and had a threesome with her senior.